html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
  margin: 0;
  padding: 0;
}

.wrapper {
  min-height: 100vh;
  display: grid;
  place-content: center;
  background: radial-gradient(ellipse at center, #999, #000);
  overflow: hidden;
}

.eclipse {
  width: 10rem;
  height: 10rem;
  border-radius: 50%;
  background-color: #000;
  border: 0.25rem solid rgb(255, 240, 240);
  box-shadow: 0 0 1rem 0.5rem rgba(255, 240, 215, 0.75);
}

.group {
  position: absolute;
  width: 100vw;
  height: 100vh;
  opacity: 0;
  animation: float 60s linear infinite;
  animation-delay: -1s;
}
.group.two {
  left: -100%;
}
.group .cloud {
  border-radius: 50%;
  position: absolute;
  top: -50vh;
}
.group .cloud.cloud-1 {
  width: 90%;
  height: 10%;
  filter: url(#filter-one);
  box-shadow: 0 60vh 55px 20px rgba(220, 220, 200, 0.8);
  left: 10%;
}
.group .cloud.cloud-2 {
  width: 40%;
  height: 20%;
  filter: url(#filter-two);
  box-shadow: 0 80vh 60px 0 rgba(233, 233, 233, 0.8);
  left: 50%;
}
.group .cloud.cloud-3 {
  width: 40%;
  height: 10%;
  filter: url(#filter-three);
  left: 0;
  box-shadow: 0 100vh 70px 20px rgba(255, 255, 255, 0.7);
}
.group .cloud.cloud-4 {
  width: 70%;
  height: 15%;
  filter: url(#filter-four);
  left: 50%;
  box-shadow: 0 130vh 80px 10px rgba(240, 240, 240, 0.8);
}

svg {
  position: absolute;
}

@keyframes float {
  0% {
    opacity: 0;
    transform: translateX(0);
  }
  1.67%, 98.33% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translateX(100%);
  }
}